'use strict';
const { Model } = require('sequelize');
const { isPrimitive } = require('sequelize/lib/utils');
const { Conflict } = require('http-errors');
module.exports = (sequelize, DataTypes) => {
  class Category extends Model {
    /**
     * Helper method for defining associations.
     * This method is not a part of Sequelize lifecycle.
     * The `models/index` file will call this method automatically.
     */
    static associate(models) {
      // define association here
      models.Category.hasMany(models.Course, { as: 'courses' });
    }
  }
  Category.init(
    {
      name: {
        type: DataTypes.STRING,
        allowNull: false,
        validate: {
          notNull: { msg: '名称必须填写' },
          notEmpty: { msg: '名称不能为空' },
          len: { args: [2, 45], msg: '长度必须是2 ~ 45之间。' },
          async isUnique(value) {
            const name = await Category.findOne({ where: { name: value } });
            if (name) {
              throw new Conflict('分类名已存在');
            }
          },
        },
      },
      rank: {
        type: DataTypes.INTEGER,
        allowNull: false,
        validate: {
          notNull: { msg: '排序必须填写' },
          notEmpty: { msg: '排序不能为空' },
          isInt: { msg: '排序必须为整数。' },
          isPrimitive(value) {
            if (value <= 0) {
              throw new Conflict('排序必须是正整数');
            }
          },
        },
      },
    },
    {
      sequelize,
      modelName: 'Category',
    }
  );
  return Category;
};
